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Nebula
A nebula is a giant cloud of gas (mostly hydrogen and helium) and cosmic dust situated between stars in the interstellar medium. Nebulae serve as sites of stellar birth and death—including emission nebulae that glow from ionized gas, reflection nebulae that scatter starlight, and dark nebulae that obscure background stars.
Source: science.nasa.gov
APODs including "Nebula"
NGC 2392 from Hubble and Chandra
30/07/2013
Atacama's Cloudy Night
27/07/2013
The Elephant's Trunk in IC 1396
26/07/2013
The Beautiful Trifid
25/07/2013
Comet Lemmon and the Deep Sky
20/07/2013
The Pillars of Eagle Castle
14/07/2013
Messier's Eleven
12/07/2013
Dusty Nebulae in Taurus
11/07/2013
Supergiant Star Gamma Cygni
09/07/2013
NGC 2170: Still Life with Reflecting Dust
07/07/2013
Sharpless 115
14/06/2013
Star Forming Region NGC 3582
11/06/2013
The Large Magellanic Cloud in Ultraviolet
10/06/2013
Messier Craters in Stereo
08/06/2013
NGC 6302: The Butterfly Nebula
07/06/2013
M57: The Ring Nebula
05/06/2013
Orion Nebula in Oxygen, Hydrogen, and Sulfur
04/06/2013
The Eagle and The Swan
31/05/2013
NGC 6960: The Witch's Broom Nebula
29/05/2013
The Large Cloud of Magellan
28/05/2013
Messier 109
23/05/2013
The Red Rectangle Nebula from Hubble
21/05/2013
Kepler's Supernova Remnant in X-Rays
15/05/2013
Galaxy Cove Vista
07/05/2013
Horsehead: A Wider View
03/05/2013
The Horsehead Nebula in Infrared from Hubble
22/04/2013
NGC 1788 and the Witch's Whiskers
19/04/2013
Star Factory Messier 17
18/04/2013
IC 1848: The Soul Nebula
15/04/2013
NGC 3132: The Southern Ring Nebula
09/04/2013